If x1=5,x2=401, and
xn=xn−2−xn−11
for every 3≤n≤m, what is the largest value of m?<spanclass=′latex−bold′>(A)</span>406<spanclass=′latex−bold′>(B)</span>2005<spanclass=′latex−bold′>(C)</span>2006<spanclass=′latex−bold′>(D)</span>2007<spanclass=′latex−bold′>(E)</span>None of the above